Explorer who found lost Inca city of Vilcabamba

In 1911, Hiram Bingham claimed Machu Picchu was the lost Inca city of Vilcabamba, but in 1964 Gene Savoy proved it was actually at Espíritu Pampa, 60km away. A BBC crew followed Savoy's trail weeks later, confirming the true location of the last Inca stronghold.